Based on the play with the same name by Florian Zeller, who is the director of this film. The play was set in Paris, but the movie is set in New York City, even though it's mostly filmed in London.
The French intern at Peter's office, played by Gabriel Ecoffey, is Director Florian Zeller's step-son, whose issues partly inspired the stage production of the play.
Second collaboration of Anthony Hopkins and Florian Zeller after the movie The Father (2020). Hopkins' role doesn't exist in the play, it was added specifically for him, to add an extra layer to Hugh Jackman's role.
The cast includes two Oscar winners: Laura Dern, Anthony Hopkins, and two nominees: Hugh Jackman, and Vanessa Kirby.